Chain-operating device



June 12, 1 928.

J. A. MORENO CHAIN OPERATING DEVICE Filed Dec. 6, 1926 2 Sheets-Sheet Inventor Attorney Jfl/Yamrg q ygwwa M June 12, 1928.

1,673,297 J. A. MORENO I CHAIN OPERATING DEVICE" Filed Dec. 6, 1926 2 Sheets-Sheet 2 tWA I Inventor Attorney Patented June 12, 1928.

El 5TATES 'Josn ANGELES MOE-END, onearvnsron, TEXAS.

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, pplieatiw fi W s 6, na -'iss a No- 34128.-

This invention relates to an improved c ic reference to a structure which may be referred to as a quick service light-weight chain block and operat ng crank therefor.

One feature of construction is the novel casting which is rotatably mounted upon a longitudinally adjustable journal, the casting including a relatively large worm gear and an especially constructed and relatively smaller sprocket for the chain.

Another feature of construction is spring means provided for normally sliding the journal in a manner upon said, frameto disengage the worm gear from the operating worm drive.

A further feature of the invention is a special crank including pawl and ratchet mechanism and an adjustable hand grip for convenience of manipulation and operation.

Other features and advantages of the invention will become apparent from the following description and drawing.

In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is an end elevation of the complete device,

Fig. 2 is an enlarged view in elevation and section looking at the side of the struc ture,

F 3 Fig. 2,

l ig. -l is a section taken approximately upon the plane of the line i l of Fig. 2,

Fig. 5 is a detail elevational View,

Fig. 6 is a section through the sprocket.

Referring to the drawings in detail it will be seen that the reference character 1 designates generally the frame which comprises a pair of spaced parallel side bars 2 connected together bv spacing bolts 3 and t having retaining nuts 5. The bolt 3 carries a supporting hook 6. The central portions of the side bars are formed with op positely disposed elongated slots 7 which serve a purpose to be hereinafter described.

Located between the side bars is the special casting 8 which includes the large worm gear 9 and special sprocket members 10 having cooperating recesses 11 and 12 for coaction with the links 13 of the chain 14:. This chain is provided at its free end with a hoisting hook 15. This casting 8 is mounted for rotation upon a journal 16 having is a section on the line of aiu operating device and has more spe- .drical portion 29.

reduced end portions 17- as represented; in Fig. 1 and slidably n'rounted in the correspondingly 'sha 'icd'slots "Tl. The journals terminate in reduced extensions-18 and coil s iirings 19' are connected therewith at one end and at their opposite ends'with stationary anchoring pins 20 carried by the side bars of the frame. In this connection I would direct attention to a laterally extendmg arm 21 having a right angularly disposed end portion 22'forming a chain guard. The worm driving element or screw 23 s rotatably mounted in a bushing 24 cast integral with the lower portion of the frame. At least one end of this element is formed with a polygonal portion'25 with which the operating crank 26 is detachably connected.

Considering now the crank member 26 it will be seen that. this embodies an adjustable hand grip 27 held in place by a keeper including a polygonal portion 28and a cylin- This "keeper is held in operative position by a spring 30 which cooperates with a pawl 31 in turn cooperating with a ratchet wrench 32. This allows the hand grip to be adjusted to any one of the positionsrepresented in Fig. 2 for instance and also allows a. step-by-step operation of the ratchet wrench. v

In practice one end of the chain is suitably anchored on the supporting frame and as soon as the load is engaged by the hook 15 the worm gear is moved downwardly against the tension of the springs 19 into mesh with the threads on the worm 23 thus providing a positive driving action between the worm and gear through the medium of the hand crank and transmitting such power to the sprocket for elevating the chain in a customary step-by-step manner. To permit quick adjustment of the chain the hook 15 is disengaged from the load whereupon the springs 19 pull the journal carrying the worm gear 9 upwardly so as to disengage the worm'gear, allowing the entire, casting 18 to rotate freely as desired.

It is believed that by considering the description in connection with the drawing a clear understanding of the construction as well as of the operation and features of invention will be had and therefore, a more lengthy description is thought unnecessary.

I claim: I

in a hoist of the class described, a pair of spaced parallel frame members attached at each end and provided with alined slotted openings intermediate their ends, a journal dlsposed between said members with its end slidahly carried in said openings and pro: vided with flat sides whereby to prevent rotation thereof, spring means carried by the members and attached to the ends" ofythe v journal adapted to urge the same toward one end of the frame member in the openings, a worm gear freely mounted for rotation on the journal, a sprocket formed integrally therewith, a guard cooperating with the sprocket for retaining a chain thereon, a worm supporting casting carried at one end of the member, a worm ro-tatably mounted tached thereto, said casting forming an at taching means for one end of a chain extending over the sprocket and adapted upon having its free end attached to an object to move the journal toward the opposite end of the frame member so as to engage the gear with the worm. y r

In testimony whereof I aifix my signature.

JOSE ANGELES MORENO 

